The Pacific sand crab is tiny - a little over an inch long at most. But shorebirds love to eat them and constantly patrol the the tideline to find crabs buried in the sand.
NPS: Sand Crabs on Santa Rosa Island
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Mean density of sand crabs Emerita analoga from surveys of eight beaches on Santa Rosa Island from 1994–2015. Curved blue line represents the statistically smoothed mean. Figure: Channel Islands National Park